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1/*
2 * linux/fs/lockd/svc4proc.c
3 *
4 * Lockd server procedures. We don't implement the NLM_*_RES
5 * procedures because we don't use the async procedures.
6 *
7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
8 */
9
10#include <linux/types.h>
11#include <linux/time.h>
12#include <linux/lockd/lockd.h>
13#include <linux/lockd/share.h>
14
15#define NLMDBG_FACILITY NLMDBG_CLIENT
16
17/*
18 * Obtain client and file from arguments
19 */
20static __be32
21nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
22 struct nlm_host **hostp, struct nlm_file **filp)
23{
24 struct nlm_host *host = NULL;
25 struct nlm_file *file = NULL;
26 struct nlm_lock *lock = &argp->lock;
27 __be32 error = 0;
28
29 /* nfsd callbacks must have been installed for this procedure */
30 if (!nlmsvc_ops)
31 return nlm_lck_denied_nolocks;
32
33 /* Obtain host handle */
34 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
35 || (argp->monitor && nsm_monitor(host) < 0))
36 goto no_locks;
37 *hostp = host;
38
39 /* Obtain file pointer. Not used by FREE_ALL call. */
40 if (filp != NULL) {
41 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
42 goto no_locks;
43 *filp = file;
44
45 /* Set up the missing parts of the file_lock structure */
46 lock->fl.fl_file = file->f_file;
47 lock->fl.fl_owner = (fl_owner_t) host;
48 lock->fl.fl_lmops = &nlmsvc_lock_operations;
49 }
50
51 return 0;
52
53no_locks:
54 nlmsvc_release_host(host);
55 if (error)
56 return error;
57 return nlm_lck_denied_nolocks;
58}
59
60/*
61 * NULL: Test for presence of service
62 */
63static __be32
64nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
65{
66 dprintk("lockd: NULL called\n");
67 return rpc_success;
68}
69
70/*
71 * TEST: Check for conflicting lock
72 */
73static __be32
74nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
75 struct nlm_res *resp)
76{
77 struct nlm_host *host;
78 struct nlm_file *file;
79 __be32 rc = rpc_success;
80
81 dprintk("lockd: TEST4 called\n");
82 resp->cookie = argp->cookie;
83
84 /* Obtain client and file */
85 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
86 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
87
88 /* Now check for conflicting locks */
89 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
90 if (resp->status == nlm_drop_reply)
91 rc = rpc_drop_reply;
92 else
93 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
94
95 nlmsvc_release_host(host);
96 nlm_release_file(file);
97 return rc;
98}
99
100static __be32
101nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
102 struct nlm_res *resp)
103{
104 struct nlm_host *host;
105 struct nlm_file *file;
106 __be32 rc = rpc_success;
107
108 dprintk("lockd: LOCK called\n");
109
110 resp->cookie = argp->cookie;
111
112 /* Obtain client and file */
113 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
114 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
115
116#if 0
117 /* If supplied state doesn't match current state, we assume it's
118 * an old request that time-warped somehow. Any error return would
119 * do in this case because it's irrelevant anyway.
120 *
121 * NB: We don't retrieve the remote host's state yet.
122 */
123 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
124 resp->status = nlm_lck_denied_nolocks;
125 } else
126#endif
127
128 /* Now try to lock the file */
129 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
130 argp->block, &argp->cookie,
131 argp->reclaim);
132 if (resp->status == nlm_drop_reply)
133 rc = rpc_drop_reply;
134 else
135 dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
136
137 nlmsvc_release_host(host);
138 nlm_release_file(file);
139 return rc;
140}
141
142static __be32
143nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
144 struct nlm_res *resp)
145{
146 struct nlm_host *host;
147 struct nlm_file *file;
148
149 dprintk("lockd: CANCEL called\n");
150
151 resp->cookie = argp->cookie;
152
153 /* Don't accept requests during grace period */
154 if (locks_in_grace()) {
155 resp->status = nlm_lck_denied_grace_period;
156 return rpc_success;
157 }
158
159 /* Obtain client and file */
160 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
161 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
162
163 /* Try to cancel request. */
164 resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
165
166 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
167 nlmsvc_release_host(host);
168 nlm_release_file(file);
169 return rpc_success;
170}
171
172/*
173 * UNLOCK: release a lock
174 */
175static __be32
176nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
177 struct nlm_res *resp)
178{
179 struct nlm_host *host;
180 struct nlm_file *file;
181
182 dprintk("lockd: UNLOCK called\n");
183
184 resp->cookie = argp->cookie;
185
186 /* Don't accept new lock requests during grace period */
187 if (locks_in_grace()) {
188 resp->status = nlm_lck_denied_grace_period;
189 return rpc_success;
190 }
191
192 /* Obtain client and file */
193 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
194 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
195
196 /* Now try to remove the lock */
197 resp->status = nlmsvc_unlock(file, &argp->lock);
198
199 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
200 nlmsvc_release_host(host);
201 nlm_release_file(file);
202 return rpc_success;
203}
204
205/*
206 * GRANTED: A server calls us to tell that a process' lock request
207 * was granted
208 */
209static __be32
210nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
211 struct nlm_res *resp)
212{
213 resp->cookie = argp->cookie;
214
215 dprintk("lockd: GRANTED called\n");
216 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
217 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
218 return rpc_success;
219}
220
221/*
222 * This is the generic lockd callback for async RPC calls
223 */
224static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
225{
226 dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
227 -task->tk_status);
228}
229
230static void nlm4svc_callback_release(void *data)
231{
232 nlmsvc_release_call(data);
233}
234
235static const struct rpc_call_ops nlm4svc_callback_ops = {
236 .rpc_call_done = nlm4svc_callback_exit,
237 .rpc_release = nlm4svc_callback_release,
238};
239
240/*
241 * `Async' versions of the above service routines. They aren't really,
242 * because we send the callback before the reply proper. I hope this
243 * doesn't break any clients.
244 */
245static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
246 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *))
247{
248 struct nlm_host *host;
249 struct nlm_rqst *call;
250 __be32 stat;
251
252 host = nlmsvc_lookup_host(rqstp,
253 argp->lock.caller,
254 argp->lock.len);
255 if (host == NULL)
256 return rpc_system_err;
257
258 call = nlm_alloc_call(host);
259 if (call == NULL)
260 return rpc_system_err;
261
262 stat = func(rqstp, argp, &call->a_res);
263 if (stat != 0) {
264 nlmsvc_release_call(call);
265 return stat;
266 }
267
268 call->a_flags = RPC_TASK_ASYNC;
269 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
270 return rpc_system_err;
271 return rpc_success;
272}
273
274static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
275 void *resp)
276{
277 dprintk("lockd: TEST_MSG called\n");
278 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
279}
280
281static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
282 void *resp)
283{
284 dprintk("lockd: LOCK_MSG called\n");
285 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
286}
287
288static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
289 void *resp)
290{
291 dprintk("lockd: CANCEL_MSG called\n");
292 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
293}
294
295static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
296 void *resp)
297{
298 dprintk("lockd: UNLOCK_MSG called\n");
299 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
300}
301
302static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
303 void *resp)
304{
305 dprintk("lockd: GRANTED_MSG called\n");
306 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
307}
308
309/*
310 * SHARE: create a DOS share or alter existing share.
311 */
312static __be32
313nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
314 struct nlm_res *resp)
315{
316 struct nlm_host *host;
317 struct nlm_file *file;
318
319 dprintk("lockd: SHARE called\n");
320
321 resp->cookie = argp->cookie;
322
323 /* Don't accept new lock requests during grace period */
324 if (locks_in_grace() && !argp->reclaim) {
325 resp->status = nlm_lck_denied_grace_period;
326 return rpc_success;
327 }
328
329 /* Obtain client and file */
330 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
331 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
332
333 /* Now try to create the share */
334 resp->status = nlmsvc_share_file(host, file, argp);
335
336 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
337 nlmsvc_release_host(host);
338 nlm_release_file(file);
339 return rpc_success;
340}
341
342/*
343 * UNSHARE: Release a DOS share.
344 */
345static __be32
346nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
347 struct nlm_res *resp)
348{
349 struct nlm_host *host;
350 struct nlm_file *file;
351
352 dprintk("lockd: UNSHARE called\n");
353
354 resp->cookie = argp->cookie;
355
356 /* Don't accept requests during grace period */
357 if (locks_in_grace()) {
358 resp->status = nlm_lck_denied_grace_period;
359 return rpc_success;
360 }
361
362 /* Obtain client and file */
363 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
364 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
365
366 /* Now try to lock the file */
367 resp->status = nlmsvc_unshare_file(host, file, argp);
368
369 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
370 nlmsvc_release_host(host);
371 nlm_release_file(file);
372 return rpc_success;
373}
374
375/*
376 * NM_LOCK: Create an unmonitored lock
377 */
378static __be32
379nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
380 struct nlm_res *resp)
381{
382 dprintk("lockd: NM_LOCK called\n");
383
384 argp->monitor = 0; /* just clean the monitor flag */
385 return nlm4svc_proc_lock(rqstp, argp, resp);
386}
387
388/*
389 * FREE_ALL: Release all locks and shares held by client
390 */
391static __be32
392nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
393 void *resp)
394{
395 struct nlm_host *host;
396
397 /* Obtain client */
398 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
399 return rpc_success;
400
401 nlmsvc_free_host_resources(host);
402 nlmsvc_release_host(host);
403 return rpc_success;
404}
405
406/*
407 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
408 */
409static __be32
410nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
411 void *resp)
412{
413 dprintk("lockd: SM_NOTIFY called\n");
414
415 if (!nlm_privileged_requester(rqstp)) {
416 char buf[RPC_MAX_ADDRBUFLEN];
417 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
418 svc_print_addr(rqstp, buf, sizeof(buf)));
419 return rpc_system_err;
420 }
421
422 nlm_host_rebooted(argp);
423 return rpc_success;
424}
425
426/*
427 * client sent a GRANTED_RES, let's remove the associated block
428 */
429static __be32
430nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp,
431 void *resp)
432{
433 if (!nlmsvc_ops)
434 return rpc_success;
435
436 dprintk("lockd: GRANTED_RES called\n");
437
438 nlmsvc_grant_reply(&argp->cookie, argp->status);
439 return rpc_success;
440}
441
442
443/*
444 * NLM Server procedures.
445 */
446
447#define nlm4svc_encode_norep nlm4svc_encode_void
448#define nlm4svc_decode_norep nlm4svc_decode_void
449#define nlm4svc_decode_testres nlm4svc_decode_void
450#define nlm4svc_decode_lockres nlm4svc_decode_void
451#define nlm4svc_decode_unlockres nlm4svc_decode_void
452#define nlm4svc_decode_cancelres nlm4svc_decode_void
453#define nlm4svc_decode_grantedres nlm4svc_decode_void
454
455#define nlm4svc_proc_none nlm4svc_proc_null
456#define nlm4svc_proc_test_res nlm4svc_proc_null
457#define nlm4svc_proc_lock_res nlm4svc_proc_null
458#define nlm4svc_proc_cancel_res nlm4svc_proc_null
459#define nlm4svc_proc_unlock_res nlm4svc_proc_null
460
461struct nlm_void { int dummy; };
462
463#define PROC(name, xargt, xrest, argt, rest, respsize) \
464 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
465 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
466 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
467 .pc_release = NULL, \
468 .pc_argsize = sizeof(struct nlm_##argt), \
469 .pc_ressize = sizeof(struct nlm_##rest), \
470 .pc_xdrressize = respsize, \
471 }
472#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
473#define No (1+1024/4) /* netobj */
474#define St 1 /* status */
475#define Rg 4 /* range (offset + length) */
476struct svc_procedure nlmsvc_procedures4[] = {
477 PROC(null, void, void, void, void, 1),
478 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
479 PROC(lock, lockargs, res, args, res, Ck+St),
480 PROC(cancel, cancargs, res, args, res, Ck+St),
481 PROC(unlock, unlockargs, res, args, res, Ck+St),
482 PROC(granted, testargs, res, args, res, Ck+St),
483 PROC(test_msg, testargs, norep, args, void, 1),
484 PROC(lock_msg, lockargs, norep, args, void, 1),
485 PROC(cancel_msg, cancargs, norep, args, void, 1),
486 PROC(unlock_msg, unlockargs, norep, args, void, 1),
487 PROC(granted_msg, testargs, norep, args, void, 1),
488 PROC(test_res, testres, norep, res, void, 1),
489 PROC(lock_res, lockres, norep, res, void, 1),
490 PROC(cancel_res, cancelres, norep, res, void, 1),
491 PROC(unlock_res, unlockres, norep, res, void, 1),
492 PROC(granted_res, res, norep, res, void, 1),
493 /* statd callback */
494 PROC(sm_notify, reboot, void, reboot, void, 1),
495 PROC(none, void, void, void, void, 0),
496 PROC(none, void, void, void, void, 0),
497 PROC(none, void, void, void, void, 0),
498 PROC(share, shareargs, shareres, args, res, Ck+St+1),
499 PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
500 PROC(nm_lock, lockargs, res, args, res, Ck+St),
501 PROC(free_all, notify, void, args, void, 1),
502
503};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/lockd/svc4proc.c
4 *
5 * Lockd server procedures. We don't implement the NLM_*_RES
6 * procedures because we don't use the async procedures.
7 *
8 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
9 */
10
11#include <linux/types.h>
12#include <linux/time.h>
13#include <linux/lockd/lockd.h>
14#include <linux/lockd/share.h>
15#include <linux/sunrpc/svc_xprt.h>
16
17#define NLMDBG_FACILITY NLMDBG_CLIENT
18
19/*
20 * Obtain client and file from arguments
21 */
22static __be32
23nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
24 struct nlm_host **hostp, struct nlm_file **filp)
25{
26 struct nlm_host *host = NULL;
27 struct nlm_file *file = NULL;
28 struct nlm_lock *lock = &argp->lock;
29 __be32 error = 0;
30
31 /* nfsd callbacks must have been installed for this procedure */
32 if (!nlmsvc_ops)
33 return nlm_lck_denied_nolocks;
34
35 /* Obtain host handle */
36 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
37 || (argp->monitor && nsm_monitor(host) < 0))
38 goto no_locks;
39 *hostp = host;
40
41 /* Obtain file pointer. Not used by FREE_ALL call. */
42 if (filp != NULL) {
43 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
44 goto no_locks;
45 *filp = file;
46
47 /* Set up the missing parts of the file_lock structure */
48 lock->fl.fl_file = file->f_file;
49 lock->fl.fl_pid = current->tgid;
50 lock->fl.fl_lmops = &nlmsvc_lock_operations;
51 nlmsvc_locks_init_private(&lock->fl, host, (pid_t)lock->svid);
52 if (!lock->fl.fl_owner) {
53 /* lockowner allocation has failed */
54 nlmsvc_release_host(host);
55 return nlm_lck_denied_nolocks;
56 }
57 }
58
59 return 0;
60
61no_locks:
62 nlmsvc_release_host(host);
63 if (error)
64 return error;
65 return nlm_lck_denied_nolocks;
66}
67
68/*
69 * NULL: Test for presence of service
70 */
71static __be32
72nlm4svc_proc_null(struct svc_rqst *rqstp)
73{
74 dprintk("lockd: NULL called\n");
75 return rpc_success;
76}
77
78/*
79 * TEST: Check for conflicting lock
80 */
81static __be32
82__nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_res *resp)
83{
84 struct nlm_args *argp = rqstp->rq_argp;
85 struct nlm_host *host;
86 struct nlm_file *file;
87 __be32 rc = rpc_success;
88
89 dprintk("lockd: TEST4 called\n");
90 resp->cookie = argp->cookie;
91
92 /* Obtain client and file */
93 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
94 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
95
96 /* Now check for conflicting locks */
97 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
98 if (resp->status == nlm_drop_reply)
99 rc = rpc_drop_reply;
100 else
101 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
102
103 nlmsvc_release_lockowner(&argp->lock);
104 nlmsvc_release_host(host);
105 nlm_release_file(file);
106 return rc;
107}
108
109static __be32
110nlm4svc_proc_test(struct svc_rqst *rqstp)
111{
112 return __nlm4svc_proc_test(rqstp, rqstp->rq_resp);
113}
114
115static __be32
116__nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_res *resp)
117{
118 struct nlm_args *argp = rqstp->rq_argp;
119 struct nlm_host *host;
120 struct nlm_file *file;
121 __be32 rc = rpc_success;
122
123 dprintk("lockd: LOCK called\n");
124
125 resp->cookie = argp->cookie;
126
127 /* Obtain client and file */
128 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
129 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
130
131#if 0
132 /* If supplied state doesn't match current state, we assume it's
133 * an old request that time-warped somehow. Any error return would
134 * do in this case because it's irrelevant anyway.
135 *
136 * NB: We don't retrieve the remote host's state yet.
137 */
138 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
139 resp->status = nlm_lck_denied_nolocks;
140 } else
141#endif
142
143 /* Now try to lock the file */
144 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
145 argp->block, &argp->cookie,
146 argp->reclaim);
147 if (resp->status == nlm_drop_reply)
148 rc = rpc_drop_reply;
149 else
150 dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
151
152 nlmsvc_release_lockowner(&argp->lock);
153 nlmsvc_release_host(host);
154 nlm_release_file(file);
155 return rc;
156}
157
158static __be32
159nlm4svc_proc_lock(struct svc_rqst *rqstp)
160{
161 return __nlm4svc_proc_lock(rqstp, rqstp->rq_resp);
162}
163
164static __be32
165__nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_res *resp)
166{
167 struct nlm_args *argp = rqstp->rq_argp;
168 struct nlm_host *host;
169 struct nlm_file *file;
170
171 dprintk("lockd: CANCEL called\n");
172
173 resp->cookie = argp->cookie;
174
175 /* Don't accept requests during grace period */
176 if (locks_in_grace(SVC_NET(rqstp))) {
177 resp->status = nlm_lck_denied_grace_period;
178 return rpc_success;
179 }
180
181 /* Obtain client and file */
182 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
183 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
184
185 /* Try to cancel request. */
186 resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock);
187
188 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
189 nlmsvc_release_lockowner(&argp->lock);
190 nlmsvc_release_host(host);
191 nlm_release_file(file);
192 return rpc_success;
193}
194
195static __be32
196nlm4svc_proc_cancel(struct svc_rqst *rqstp)
197{
198 return __nlm4svc_proc_cancel(rqstp, rqstp->rq_resp);
199}
200
201/*
202 * UNLOCK: release a lock
203 */
204static __be32
205__nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_res *resp)
206{
207 struct nlm_args *argp = rqstp->rq_argp;
208 struct nlm_host *host;
209 struct nlm_file *file;
210
211 dprintk("lockd: UNLOCK called\n");
212
213 resp->cookie = argp->cookie;
214
215 /* Don't accept new lock requests during grace period */
216 if (locks_in_grace(SVC_NET(rqstp))) {
217 resp->status = nlm_lck_denied_grace_period;
218 return rpc_success;
219 }
220
221 /* Obtain client and file */
222 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
223 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
224
225 /* Now try to remove the lock */
226 resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock);
227
228 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
229 nlmsvc_release_lockowner(&argp->lock);
230 nlmsvc_release_host(host);
231 nlm_release_file(file);
232 return rpc_success;
233}
234
235static __be32
236nlm4svc_proc_unlock(struct svc_rqst *rqstp)
237{
238 return __nlm4svc_proc_unlock(rqstp, rqstp->rq_resp);
239}
240
241/*
242 * GRANTED: A server calls us to tell that a process' lock request
243 * was granted
244 */
245static __be32
246__nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_res *resp)
247{
248 struct nlm_args *argp = rqstp->rq_argp;
249
250 resp->cookie = argp->cookie;
251
252 dprintk("lockd: GRANTED called\n");
253 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
254 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
255 return rpc_success;
256}
257
258static __be32
259nlm4svc_proc_granted(struct svc_rqst *rqstp)
260{
261 return __nlm4svc_proc_granted(rqstp, rqstp->rq_resp);
262}
263
264/*
265 * This is the generic lockd callback for async RPC calls
266 */
267static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
268{
269 dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
270 -task->tk_status);
271}
272
273static void nlm4svc_callback_release(void *data)
274{
275 nlmsvc_release_call(data);
276}
277
278static const struct rpc_call_ops nlm4svc_callback_ops = {
279 .rpc_call_done = nlm4svc_callback_exit,
280 .rpc_release = nlm4svc_callback_release,
281};
282
283/*
284 * `Async' versions of the above service routines. They aren't really,
285 * because we send the callback before the reply proper. I hope this
286 * doesn't break any clients.
287 */
288static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc,
289 __be32 (*func)(struct svc_rqst *, struct nlm_res *))
290{
291 struct nlm_args *argp = rqstp->rq_argp;
292 struct nlm_host *host;
293 struct nlm_rqst *call;
294 __be32 stat;
295
296 host = nlmsvc_lookup_host(rqstp,
297 argp->lock.caller,
298 argp->lock.len);
299 if (host == NULL)
300 return rpc_system_err;
301
302 call = nlm_alloc_call(host);
303 nlmsvc_release_host(host);
304 if (call == NULL)
305 return rpc_system_err;
306
307 stat = func(rqstp, &call->a_res);
308 if (stat != 0) {
309 nlmsvc_release_call(call);
310 return stat;
311 }
312
313 call->a_flags = RPC_TASK_ASYNC;
314 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
315 return rpc_system_err;
316 return rpc_success;
317}
318
319static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp)
320{
321 dprintk("lockd: TEST_MSG called\n");
322 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, __nlm4svc_proc_test);
323}
324
325static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp)
326{
327 dprintk("lockd: LOCK_MSG called\n");
328 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, __nlm4svc_proc_lock);
329}
330
331static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp)
332{
333 dprintk("lockd: CANCEL_MSG called\n");
334 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, __nlm4svc_proc_cancel);
335}
336
337static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp)
338{
339 dprintk("lockd: UNLOCK_MSG called\n");
340 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlm4svc_proc_unlock);
341}
342
343static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp)
344{
345 dprintk("lockd: GRANTED_MSG called\n");
346 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, __nlm4svc_proc_granted);
347}
348
349/*
350 * SHARE: create a DOS share or alter existing share.
351 */
352static __be32
353nlm4svc_proc_share(struct svc_rqst *rqstp)
354{
355 struct nlm_args *argp = rqstp->rq_argp;
356 struct nlm_res *resp = rqstp->rq_resp;
357 struct nlm_host *host;
358 struct nlm_file *file;
359
360 dprintk("lockd: SHARE called\n");
361
362 resp->cookie = argp->cookie;
363
364 /* Don't accept new lock requests during grace period */
365 if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
366 resp->status = nlm_lck_denied_grace_period;
367 return rpc_success;
368 }
369
370 /* Obtain client and file */
371 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
372 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
373
374 /* Now try to create the share */
375 resp->status = nlmsvc_share_file(host, file, argp);
376
377 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
378 nlmsvc_release_lockowner(&argp->lock);
379 nlmsvc_release_host(host);
380 nlm_release_file(file);
381 return rpc_success;
382}
383
384/*
385 * UNSHARE: Release a DOS share.
386 */
387static __be32
388nlm4svc_proc_unshare(struct svc_rqst *rqstp)
389{
390 struct nlm_args *argp = rqstp->rq_argp;
391 struct nlm_res *resp = rqstp->rq_resp;
392 struct nlm_host *host;
393 struct nlm_file *file;
394
395 dprintk("lockd: UNSHARE called\n");
396
397 resp->cookie = argp->cookie;
398
399 /* Don't accept requests during grace period */
400 if (locks_in_grace(SVC_NET(rqstp))) {
401 resp->status = nlm_lck_denied_grace_period;
402 return rpc_success;
403 }
404
405 /* Obtain client and file */
406 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
407 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
408
409 /* Now try to lock the file */
410 resp->status = nlmsvc_unshare_file(host, file, argp);
411
412 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
413 nlmsvc_release_lockowner(&argp->lock);
414 nlmsvc_release_host(host);
415 nlm_release_file(file);
416 return rpc_success;
417}
418
419/*
420 * NM_LOCK: Create an unmonitored lock
421 */
422static __be32
423nlm4svc_proc_nm_lock(struct svc_rqst *rqstp)
424{
425 struct nlm_args *argp = rqstp->rq_argp;
426
427 dprintk("lockd: NM_LOCK called\n");
428
429 argp->monitor = 0; /* just clean the monitor flag */
430 return nlm4svc_proc_lock(rqstp);
431}
432
433/*
434 * FREE_ALL: Release all locks and shares held by client
435 */
436static __be32
437nlm4svc_proc_free_all(struct svc_rqst *rqstp)
438{
439 struct nlm_args *argp = rqstp->rq_argp;
440 struct nlm_host *host;
441
442 /* Obtain client */
443 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
444 return rpc_success;
445
446 nlmsvc_free_host_resources(host);
447 nlmsvc_release_host(host);
448 return rpc_success;
449}
450
451/*
452 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
453 */
454static __be32
455nlm4svc_proc_sm_notify(struct svc_rqst *rqstp)
456{
457 struct nlm_reboot *argp = rqstp->rq_argp;
458
459 dprintk("lockd: SM_NOTIFY called\n");
460
461 if (!nlm_privileged_requester(rqstp)) {
462 char buf[RPC_MAX_ADDRBUFLEN];
463 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
464 svc_print_addr(rqstp, buf, sizeof(buf)));
465 return rpc_system_err;
466 }
467
468 nlm_host_rebooted(SVC_NET(rqstp), argp);
469 return rpc_success;
470}
471
472/*
473 * client sent a GRANTED_RES, let's remove the associated block
474 */
475static __be32
476nlm4svc_proc_granted_res(struct svc_rqst *rqstp)
477{
478 struct nlm_res *argp = rqstp->rq_argp;
479
480 if (!nlmsvc_ops)
481 return rpc_success;
482
483 dprintk("lockd: GRANTED_RES called\n");
484
485 nlmsvc_grant_reply(&argp->cookie, argp->status);
486 return rpc_success;
487}
488
489
490/*
491 * NLM Server procedures.
492 */
493
494#define nlm4svc_encode_norep nlm4svc_encode_void
495#define nlm4svc_decode_norep nlm4svc_decode_void
496#define nlm4svc_decode_testres nlm4svc_decode_void
497#define nlm4svc_decode_lockres nlm4svc_decode_void
498#define nlm4svc_decode_unlockres nlm4svc_decode_void
499#define nlm4svc_decode_cancelres nlm4svc_decode_void
500#define nlm4svc_decode_grantedres nlm4svc_decode_void
501
502#define nlm4svc_proc_none nlm4svc_proc_null
503#define nlm4svc_proc_test_res nlm4svc_proc_null
504#define nlm4svc_proc_lock_res nlm4svc_proc_null
505#define nlm4svc_proc_cancel_res nlm4svc_proc_null
506#define nlm4svc_proc_unlock_res nlm4svc_proc_null
507
508struct nlm_void { int dummy; };
509
510#define PROC(name, xargt, xrest, argt, rest, respsize) \
511 { .pc_func = nlm4svc_proc_##name, \
512 .pc_decode = nlm4svc_decode_##xargt, \
513 .pc_encode = nlm4svc_encode_##xrest, \
514 .pc_release = NULL, \
515 .pc_argsize = sizeof(struct nlm_##argt), \
516 .pc_ressize = sizeof(struct nlm_##rest), \
517 .pc_xdrressize = respsize, \
518 }
519#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
520#define No (1+1024/4) /* netobj */
521#define St 1 /* status */
522#define Rg 4 /* range (offset + length) */
523const struct svc_procedure nlmsvc_procedures4[] = {
524 PROC(null, void, void, void, void, 1),
525 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
526 PROC(lock, lockargs, res, args, res, Ck+St),
527 PROC(cancel, cancargs, res, args, res, Ck+St),
528 PROC(unlock, unlockargs, res, args, res, Ck+St),
529 PROC(granted, testargs, res, args, res, Ck+St),
530 PROC(test_msg, testargs, norep, args, void, 1),
531 PROC(lock_msg, lockargs, norep, args, void, 1),
532 PROC(cancel_msg, cancargs, norep, args, void, 1),
533 PROC(unlock_msg, unlockargs, norep, args, void, 1),
534 PROC(granted_msg, testargs, norep, args, void, 1),
535 PROC(test_res, testres, norep, res, void, 1),
536 PROC(lock_res, lockres, norep, res, void, 1),
537 PROC(cancel_res, cancelres, norep, res, void, 1),
538 PROC(unlock_res, unlockres, norep, res, void, 1),
539 PROC(granted_res, res, norep, res, void, 1),
540 /* statd callback */
541 PROC(sm_notify, reboot, void, reboot, void, 1),
542 PROC(none, void, void, void, void, 0),
543 PROC(none, void, void, void, void, 0),
544 PROC(none, void, void, void, void, 0),
545 PROC(share, shareargs, shareres, args, res, Ck+St+1),
546 PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
547 PROC(nm_lock, lockargs, res, args, res, Ck+St),
548 PROC(free_all, notify, void, args, void, 1),
549
550};